First, you must add all five numbers. If you do so, you should get 390.
Then, you divide the sum of the numbers (390) by the amount of numbers you have (5).
390 divided by 5 gives you 78.
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93
It is: 89/99
8811.
9 19 29 39 49 59 69 79 89 90 91 92 93 94 95 96 97 98 99 Answer: 20 (99 has 2 9's)
99 x 10 - 99 x 9 = 99(1 x 10 - 1 x 9) = 99(10 - 9) = 99(1) =99